Quote:
Originally Posted by SouthArk370Z
The bottle is vented to atmosphere so lack of a cap won't affect operation, but you're likely to slosh antifreeze into the engine compartment - messy stuff.
I'd ask an expert (or two or three) about how the washer fluid will affect the coolant before driving very much.
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If you're concerned about sloshing, use some foil and wire to cap off the reservoir
Similar to plastic wrap and a rubber band, but I would use materials that can handle the heat being in the engine bay.